Fall Back if Derived CParams are Incompatible with DDSS; Refactor CDict Creation
Fall Back if Derived CParams are Incompatible with DDSS; Refactor CDict Creation

Rewrite ZSTD_createCDict_advanced() as a wrapper around
ZSTD_createCDict_advanced2(). Evaluate whether to use DDSS mode *after* fully
resolving cparams. If not, fall back.

Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd